Improvement in lock-nuts



A. w. BuNNELL.

Lock-N ut for Bolts.

No.118,685. Patented Sep. 5. 1811.

PATENT EEICE.

AARON WHITED BUNNELL, OF LINEVILLE, PENNSYLVANIA.

IMPROVEMENT IN LUCK-NUTS.

Specification forming part of Letters Patent No. 118,685, dated September 5, 1871.

To all whom it may concern:

Be it known that I, AARON WHITED BUNNELL, of Lineville, in the county of Crawford, State of Pennsylvania, have invented a new and Improved Lock-Nut for Screw-Bolts and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawing and the letters of reference marked thereon.

The object of my invention is to construct a screw-bolt and lock-nut that will not unscrew by the jar of machinery or any other cause.

A, Figure 1, represents the screw-bolt at the screw end. One-halt'cf the screw at B is cut with a coarse thread and the other part, C, with a fine screw. The screw-shaft is a little smaller at the fine thread so that the first nut will slip over the tine thread.

Fig. 2 shows the bolt, with the nut in place. Through the corner of the nuts E and H is a keyseat, S, in which the spring-key D is placed.

Its operation is as follows, to wit: The bolt is put in place and the nut E with the coarse thread is turned home, and the nut H with the ne thread is turned on top down on E, and the key D placed in the seat. This securely locks the nuts, and even if the key D is drawn out and the nuts E and H commence to turn, the nut E with the coarse thread will travel so much faster than H that it will catch it and bind it.

A key might be run through a hole in the nut H and E, shown at m, instead of D.

Vhat I claim as my invention, and desire to secure by Letters Patent, is as follows7 to wit:

l. A bolt, with two screw-nuts, constructed as described, one with a coarse and the other with a iine thread.

2. The said nuts, in combination with the key D, constructed as described, for the purposes set forth.

A AARON WHITED BUNNELL. Witnesses:

A. B. RICHMOND, GEO. 0. MORGAN. 

